As far as I am aware the version 3.0.1 is the official latest published version: https://semiceu.github.io/DCAT-AP/releases/3.0.1/
However in that document the 'latest published version' points to the 3.0.0 document.
The 3.0.0 document also seems to indicate that it is the latest published version and points to the 3.0.1-draft as being the latest version.
It would be very helpful if the version management is pointing us to the actual correct latest version.